Bumraary. The linear-quadratie dependence of effect on the dose of ionizing radiation and its biophysical implieations are eonsidered. The estimation of the parameters of the response funetion and the derivation of the joint eonfidenee region of the estimates are deseribed. The method is applied to the induetion of pink mutations in Tradescantia which follows the linearquadratie model. The s$at...

OR some time it has been generally considered that the production of F chromosomal aberrations in Tradescantia and many other materials is essentially independent of the wave length of the exciting radiation in the region shorter than 1.5 A. This view has not been seriously questioned in recent years and to date has remained one of the fundamental tenets of radiobiology. A number of isolated in...

The use of anthocyanin dyes extracted from epidermal leaves of Tradescantia spathacea (Trant) and petals of Ixora coccinea (IX) was evaluated in the application of dye-sensitized solar cells (DSSCs). Subsequently, cocktail anthocyanin dyes from these dyes were prepared and how they enhanced the cell's overall performance was assessed using five different volume-to-volume ratios. Cocktail dyes a...

Chromosome ring formation has been found in a number of difierent genera. In certain species of Oenothera and of Hypericum and in the monotypic genus Rhoeo, all the chromosomes may be united in a single ring or chain a t meiosis. Ring formation is maintained in these plants by a system of balanced lethals. In Datura, Zea, Pisum and Campanula rings of four or more chromosomes have been described...

Two proteins which have carbonate dehydratase (carbonic anhydrase, EC 4.2.1.1) activity were shown to be in the chloroplasts and in the cytosol of leaves of Brassica chinensis, Spinacia oleracea, and in variegated leaves of Tradescantia albiflora and Hedera canariensis. The chloroplastic enzyme is smaller than the one in the cytosol, as it runs farther on gradient polyacrylamide gels. It was se...

HE studies of THODAY and READ (1947) using root-tip cells of Vicia T j a b a demonstrated that oxygen has a marked effect in increasing the frequency of X-ray-induced chromosome aberrations. These investigators later showed (1949) that when alpha rays are used, the oxygen effect is much less, since the yield of aberrations with oxygen present was only slightly greater than in its absence. In ex...